JPH0543373B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a vacuum cleaner, and more particularly,
This invention relates to a vacuum cleaner equipped with a noise reduction mechanism.

[Conventional technology]

A conventional vacuum cleaner equipped with a noise reduction mechanism is described, for example, in Japanese Utility Model Application Publication No. 115853/1983. By providing a sound-absorbing box located in the flow path and having one intake port and multiple exhaust holes, a resonant sound muffler is constructed between the outer circumferential surface of this sound-absorbing box and the inner wall of the vacuum cleaner body. It is something.

In addition, in the "prior art" section of the above-mentioned Utility Model Publication No. 62-115853, there is a section on the inside wall of the vacuum cleaner body, that is, a part of the vacuum cleaner body located between the electric blower chamber and the adjacent exhaust flow path. A configuration is shown in which part of the exhaust flow from the electric blower room side is detoured through the inner wall.

[Problem to be solved by the invention]

Therefore, in the vacuum cleaner equipped with the resonance type noise reduction function, the exhaust flow from the electric blower room side is as follows.
The exhaust air is discharged into a relatively large space inside the vacuum cleaner body through a large number of exhaust holes provided in the sound-absorbing box, and the noise reduction effect, which is a characteristic of resonance type mufflers, is achieved by reducing the noise level in a certain frequency band. It is possible to reduce the

However, in the case of vacuum cleaner noise, when frequency analysis is performed, there are often peaks at multiple frequencies. Therefore, it is difficult to obtain the sufficient noise reduction effect of vacuum cleaners with a resonant silencer. I can't.

Further, the electric blower used in a vacuum cleaner is a commutator motor, and its rotational speed changes depending on changes in load. Specifically, in the initial state when dust is not being sucked in, the rotation speed is low (generally 20,000 ~
27,000rpm), and when dust is sucked in and ventilation resistance increases, the rotational speed becomes high (generally 28,000 to 36,000rpm), so the frequency of rotational vibration sound depending on the rotational speed is not constant, and only the noise level in a specific frequency band is measured. It must be said that the practical noise reduction effect of resonance type silencers that can reduce noise is low.

On the other hand, in conventional vacuum cleaners, the air flows from the electric blower room side through a part of the inner wall of the vacuum cleaner body, that is, the inner wall of the vacuum cleaner body located between the electric blower room and the adjacent exhaust flow path. In vacuum cleaners that employ a configuration that partially detours the exhaust flow, the exhaust flow from the electric blower room side is not directly exhausted to the outside of the machine. Sound energy is converted to thermal energy while passing through the air, and although a certain degree of noise reduction effect is recognized, in conventional vacuum cleaners of this type, the length of the exhaust flow path is simply lengthened. The noise transmitted through the vacuum cleaner body was still large, and there was room for improvement from the perspective of making the vacuum cleaner sufficiently quiet.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, it is an object of the present invention to provide a silent vacuum cleaner that has an excellent noise reduction effect, suppresses the increase in the number of parts that accompany noise reduction, and is highly productive. It is in.

[Means to solve the problem]

The above purpose is to provide an electric blower room with a built-in electric blower installed next to the electric blower room, and
In a vacuum cleaner equipped with a vacuum cleaner main body having a cord storage chamber incorporating a cord winding device, the vacuum cleaner is provided between the electric blower chamber and the cord storage chamber, and the exhaust flow path is of a resistance-silencing type. an exhaust duct located behind the electric blower and provided between the exhaust port of the exhaust duct and an exhaust port provided at the rear of the vacuum cleaner; an expansion chamber having a cross-sectional area larger than the vacuum cleaner body; and an electric blower cover that covers above the electric blower, and the exhaust duct includes a first duct portion that is integrally formed with the electric blower cover and that is connected to the electric blower room; It is formed by a partition wall provided integrally with the inner bottom of the lower case part and includes a second duct part connected to the expansion chamber, and the exhaust air from the electric blower chamber is once guided forward by the first duct part and then This is achieved by making a U-turn and leading to the second duct portion.

[Effect]

According to the present invention having the above configuration,
By providing an electric blower cover that surrounds the electric blower as a member to hold the electric blower, the vacuum cleaner body has a double structure, which reduces the amount of exhaust noise generated by the electric blower that passes through the vacuum cleaner body. can also be significantly reduced. In addition to this, an exhaust duct is provided between the electric blower room and the cord storage room, and this exhaust duct is provided with resistance to bypass the exhaust flow from the electric blower room side surrounded by the electric blower cover. By adopting a sound-muffling type exhaust flow path, the exhaust flow from the electric blower room side passes through the resistance sound-muffling detour, and the muffling energy is converted into thermal energy, which also has the effect of reducing exhaust noise. can be achieved. In addition,
In the field of noise level reduction technology, it is known that resistance-type silencers, unlike resonance-type silencers, can reduce noise level peaks in multiple frequency bands. It is preferable to incorporate it into the machine body in order to reduce the noise of the vacuum cleaner.

Moreover, the exhaust air from the electric blower room is once guided forward through the first duct part of the exhaust duct, then makes a U-turn, passes through the second duct part of the exhaust duct, and is led to the expansion chamber. Therefore, even though the exhaust duct is provided in the narrow space between the electric blower room and the cord storage room, a long U-shaped exhaust passage can be formed, and a sufficient sound absorption area can be secured. , exhaust noise can be effectively muffled.

Further, the exhaust gas from the electric blower expands in the electric blower room, is compressed in a resistance-muffling exhaust duct, and then expands again in an expansion chamber having a cross-sectional area larger than the cross-sectional area of the exhaust port of the exhaust duct. This expansion/compression action effectively reduces exhaust noise.

In addition, an exhaust duct provided between the electric blower chamber and the cord storage chamber is provided integrally with the first duct part provided integrally with the electric blower cover and the inner bottom of the lower case part that constitutes the vacuum cleaner body. Since the exhaust duct is made up of the second duct portion formed by the partition wall, the exhaust duct can be constructed without increasing the number of parts, resulting in excellent productivity.

〔Example〕

Hereinafter, the present invention will be explained based on an embodiment of the drawings. FIG. 1 is a partial cross-sectional view of the vacuum cleaner main body 1, FIG. 2 is a longitudinal sectional front view showing the overall structure of the vacuum cleaner main body 1, and FIG. 3 is a partially vertical side view of the vacuum cleaner main body 1, and FIG. 4 is an external perspective view of the electric blower cover shown at 43 in FIGS. 1 to 3.

The vacuum cleaner main body 1 consists of a lower case 2 located below, a dust collection lid 3 and an upper case 4 located above, a handle 5 located at the front, and a shock absorbing shock absorber provided on the outer periphery. The bumper 6 constitutes the exterior, and the interior includes an electric blower 7, a cord winding device 8, a dust collection bag 9, and the like. The lower case 2 is equipped with casters 10 at the front and wheels 11 at the rear. Further, a receiving portion 12 for holding an extension tube (not shown) is provided at the front of the lower case 2. The upper case 4 is provided with an accessory mouthpiece storage part 13 at the rear thereof, and an opening/closing lid 14 is attached above the accessory mouthpiece storage part 13. The attached suction ports include a tapered gap suction port 15, a narrow suction port 17 with a brush 16 attached to the tip, and a T-shaped clothing suction port 18. These three types of suction ports 15, 17, and 18 are It is stored in the attached mouthpiece storage section 13.

A filter case 21 provided with an exhaust filter 20 is removably housed between the attached suction opening storage section 13 and the vacuum cleaner main body exhaust port 19. The exhaust filter 20 is a high-performance type that uses static electricity to collect dust.In order to maintain airtightness between the filter case 21 equipped with the exhaust filter 20 and the upper case 4, the filter case 21 is equipped with a , an exhaust airtight packing 22 is provided. The attached suction opening storage section 13 is located between an exhaust duct 42 and a vacuum cleaner main body exhaust port 19, which will be described later, and has a relatively wide space. It consists of That is, an expansion chamber 23 having a cross-sectional area larger than the cross-sectional area of the exhaust duct exhaust port 46 is provided between the exhaust duct exhaust port 46 and the vacuum cleaner main body exhaust port 19 .

A dust indicator 24 is provided on the upper surface of the upper case 4 to notify when it is time to throw away garbage, and an indicator cover 25 is further provided to hold the dust indicator 24 from the outside. On both sides of the indicator cover 25, there are switch pedals 26 for opening and closing a power switch (not shown);
A reel pedal 27 that operates to stop the cord winding device 8 is provided.

In front of the dust collection chamber 3, a clamp 28 for opening and closing the dust collection chamber 3 is elastically supported by a clamp spring 29, and a hose (not shown) is mounted on the upper surface of the dust collection chamber 3. A hose insertion port 30 is provided, and a hose insertion portion 31 of the hose insertion port 30 is provided.
is rotatably held by the dust collection chamber 3 and the dust collection inner lid 32 so as to rotatably support the hose inserted into the hose insertion part 31.
A hose insertion part cover 33 is provided above the hose insertion port 30 to close off the dust collection part when the vacuum cleaner is not in use. In addition, the hose insertion part 31 is provided with an airtight gasket 34 that airtightly maintains the space between the hose inserted into the hose insertion part 31 and the dust collection part, and further includes the dust collection lid 3 and the dust collection part. A lid packing 35 is provided between the inner lid 32 and the inner lid 32 to keep the space between the two airtight. The dust collection bag 9 is held by a vertical rib 36 provided on the lower case 2 and a filter stand 37. The dust collection lid 3 is rotatably supported by the upper case 4, and is configured to have a buffer spring 38 so that opening and closing operations when opening and closing the lid are made gentle. Further, a secondary filter 39 is disposed between the dust collection bag 9 and the electric blower 7.

The electric blower 7 is housed in an electric blower chamber 40, and the cord winding device 8 is housed in a cord storage chamber 41, and is located between the electric blower 40 and the cord storage chamber 41. Electric blower room 4
An exhaust duct 42 is provided to introduce the exhaust flow from the zero side. The electric blower room 40 is located in the lower case 2
It is composed of a partition wall 2a integrally formed on the inner bottom of the air blower, and an electric blower cover 43 that is mounted on the partition wall 2a and covers the electric blower 40 above.

The exhaust duct 42 is formed by a first duct portion 42a that is integrally formed with the electric blower cover 43 and connected to the electric blower chamber 40, and partition walls 2a and 2b that are integrally provided with the inner bottom of the lower case 2, The exhaust air from the electric blower chamber 40 is once guided to the front inside the cleaner main body 1 through the first duct section 42a, and then made a U-turn and then transferred to the second duct section. 42b. Further, the inside of the exhaust duct 42 is lined with a sound absorbing material 44 such as polyurethane foam, and the flow path of the exhaust duct 42 is formed in a U-shape, with an intake port 45 for introducing the exhaust gas from the electric blower 7. It has an exhaust port 46. On the other hand, the electric blower 7 has anti-vibration rubber 47,
48, and a sound absorbing cover 4 made of a sound absorbing material on the outer periphery.
It is equipped with 9.

In the above configuration, the flow of air when the power switch is turned on is discharged from the dust collecting section through the electric blower 7 and into the electric blower room 40. Next, the exhaust flow is compressed and enters the exhaust duct 42 through the intake port 45 of the exhaust duct 42 that introduces the exhaust gas from the electric blower 7, is guided in a U-shape inside the exhaust duct 42, and is guided through the exhaust port 42. 46 into the expansion chamber 23,
After being expanded in the expansion chamber 23, it passes through the exhaust filter 20 and is discharged outside the vacuum cleaner body through the exhaust port 19.

As a member for holding the electric blower 7,
An electric blower cover 4 surrounding the electric blower 7
3, the vacuum cleaner main body 1 has a double structure consisting of the electric blower cover 43 and the upper case 4, and further includes the indicator cover 25 and the opening/closing lid 14.
Considering this, it becomes a triple structure, and the electric blower 7
It is possible to significantly reduce the sound transmitted through the vacuum cleaner body, which is the source of the exhaust noise. In addition, an exhaust duct 42 is provided between the electric blower chamber 40 and the cord storage chamber 41, and the exhaust duct 42 is connected to the electric blower chamber 40 side surrounded by the electric blower cover 43. Since the exhaust flow path is of a resistance-silencing type through which the exhaust flow detours, the sound energy of the exhaust flow from the electric blower room 40 side is converted into thermal energy while passing through the resistance-silencing type bypass path. This also makes it possible to reduce exhaust noise.

Furthermore, by disposing a sound absorbing cover 49 made of a sound absorbing material between the electric blower cover 43 that surrounds the electric blower 7 and the electric blower 7, the effect of reducing exhaust noise can be made even more effective. can.

By lining the inside of the exhaust duct 42 with a sound absorbing material 44, the effect of reducing exhaust noise can be made even more effective.

Furthermore, by providing an expansion chamber 23 having a cross-sectional area larger than the cross-sectional area of the exhaust port of the exhaust duct 42 between the exhaust port 46 of the exhaust duct 42 and the exhaust port 19 of the vacuum cleaner body 1, the electric blower 7 can be The exhaust gas is expanded in the electric blower chamber 40, compressed in the resistance-silenced exhaust duct 42, and expanded again in the expansion chamber 23 between the exhaust port 46 of the exhaust duct 42 and the exhaust port 19 of the vacuum cleaner body 1. This expansion/compression effect also makes the exhaust noise reduction effect even more effective.

〔Effect of the invention〕

According to the present invention, the sound transmitted through the vacuum cleaner body is significantly suppressed by the electric blower cover that covers the upper part of the electric blower, and in addition, there is a long U-shaped exhaust flow path between the electric blower chamber and the cord storage chamber. The exhaust noise can be effectively reduced by the exhaust duct forming the vacuum cleaner and the expansion chamber connected to the exhaust duct. Since the exhaust duct consists of a second duct part formed by a partition wall that is integrated with the inner bottom of the lower case, the increase in the number of parts associated with forming the exhaust duct can be suppressed. A quiet vacuum cleaner with excellent performance can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partial cross-sectional plan view of the vacuum cleaner main body, Fig. 2 is a longitudinal sectional front view showing the overall structure of the vacuum cleaner main body, and Fig. 3 is a partial cross-sectional plan view of the vacuum cleaner main body. FIG. 4 is an external perspective view of the electric blower cover. 1...Vacuum cleaner body, 2...Lower case, 2a, 2b...
Partition wall, 7... electric blower, 8... cord winding device,
19...Exhaust port of the vacuum cleaner body, 23...Expansion chamber, 40
...Electric blower room, 41...Cord storage room, 42...Exhaust duct, 42a...First duct part, 42b...Second
Duct portion, 43...Electric blower cover, 45...Intake port of exhaust duct, 46...Exhaust port of exhaust duct.

Claims (1)

[Scope of Claims] 1. An electric cleaner that includes a vacuum cleaner body that has an electric blower room that houses an electric blower, and a cord storage room that is installed next to the electric blower room and has a cord winder built in. In the vacuum cleaner, an exhaust duct is provided between the electric blower chamber and the cord storage chamber and has an exhaust flow path of a resistance-silencing type; and an exhaust duct located behind the electric blower and of the exhaust duct an expansion chamber having a cross-sectional area larger than the cross-sectional area of the exhaust port of the exhaust duct, the expansion chamber being provided between the exhaust port and the exhaust port provided at the rear of the vacuum cleaner; comprises a partition wall provided integrally with the inner bottom of the lower case part constituting the vacuum cleaner body, and an electric blower cover mounted on the partition wall and covering above the electric blower, The exhaust duct is formed by a first duct part that is integrally formed with the electric blower cover and that is connected to the electric blower chamber, and a partition wall that is integrally provided with the inner bottom of the lower case part,
and a second duct part connected to the expansion chamber, and the exhaust air from the electric blower room is first guided forward by the first duct part, and then made a U-turn and guided to the second duct part. A vacuum cleaner featuring: